B3031

DTC B3031

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC B3031 00
- Security Controller In Learn Mode Malfunction

Circuit/System Description

When learning a keyless entry transmitter, the body control module (BCM) is placed in learn mode. DTC B3031 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the transmitter is learned, learn mode will be exited and the DTC cleared. If the BCM does not exit learn mode, B3031 will remain current and indicate a fault. The instrument cluster security indicator will illuminate and the driver information center will display a message.

Conditions for Running the DTC

The immobilizer system is the learn mode.

Conditions for Setting the DTC

The DTC will set any time the BCM enters the learn mode.

Action Taken When the DTC Sets

The security indicator will illuminate. The driver information center will display a message.

Conditions for Clearing the DTC

* A current DTC B3031 will be cleared upon the successful exit of learn mode.
* A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

Reference Information
Schematic Reference

Immobilizer Schematics Immobilizer Schematics
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

Immobilizer Description and Operation Immobilizer
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module Referencesfor scan tool information

Circuit/System Verification

1. Verify all available keyless entry transmitters are correct for the vehicle. This can be accomplished by comparing the part number that is laser etched on the transmitter to the part number listed in the parts catalog.

• If a transmitter is not correct
Replace the key

• If all transmitters are correct

2. Perform the Replacing Transmitters procedure. Refer to Remote Control Door Lock and Theft Deterrent Transmitter Programming Testing and Inspection.
3. Verify the BCM learns the transmitter and exits the learn mode. The scan tool BCM Master Keys Learned parameter should increment to 1.

• If the BCM does not exit the learn mode after the programming attempt
Replace the K9 BCM

• If the BCM exits the learn mode after the programming attempt

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module Referencesfor BCM replacement, setup and programming